Garmin HRM-Swim Heart rate monitor

 Garmin heart rate strap designed for pool swimming, but is good for multi-sport activities involving a pool swim. Smallest and lightest heart rate monitor from Garmin: 29.4 x 51.4 x 8.5mm / 1.8oz Stores up to 20 hours of heart rate data during swims, then forwards it to a compatible device at the end of the session Durable construction withstands repeated exposure to all swim environments, including pools, salt and fresh water Non-slip design keeps the monitor in place, even during push-offs from pool walls